From: Christian Brauner <brauner@kernel.org>
Date: Tue, 24 Jun 2025 14:57:51 +0000 (+0200)
Subject: uapi/fcntl: add FD_PIDFS_ROOT
X-Git-Tag: v6.17-rc1~218^2~3^2~2
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=3941e37f62fe2c3c;p=thirdparty%2Fkernel%2Fstable.git

uapi/fcntl: add FD_PIDFS_ROOT

Add a special file descriptor indicating the root of the pidfs
filesystem.

Signed-off-by: Christian Brauner <brauner@kernel.org>
---

diff --git a/include/uapi/linux/fcntl.h b/include/uapi/linux/fcntl.h
index a5bebe7c44008..f291ab4f94ebc 100644
--- a/include/uapi/linux/fcntl.h
+++ b/include/uapi/linux/fcntl.h
@@ -110,6 +110,7 @@
 #define PIDFD_SELF_THREAD		-10000 /* Current thread. */
 #define PIDFD_SELF_THREAD_GROUP		-10001 /* Current thread group leader. */
 
+#define FD_PIDFS_ROOT			-10002 /* Root of the pidfs filesystem */
 #define FD_INVALID			-10009 /* Invalid file descriptor: -10000 - EBADF = -10009 */
 
 /* Generic flags for the *at(2) family of syscalls. */